It amazes me that even professionals still think they can eliminate odours by shampooing the interior, and spraying a deodorizer. Nothing is farther from the truth, technically, an odour is an invisible gas, and so it can permeate any material or crevice. Many odours are caused by micro-organisms such as bacteria, mould, and mildew. Not only does shampooing not eradicate these odours, it spreads them over a much wider area